血中生物活性最强的甲状腺激素是

• A.游离T<img src="http://timg.fentiku.com/393/2021/10/19/GrR0n4a30b.png" title='GrR0n4a30b.png' alt='GrR0n4a30b.png'/>
• B.结合T<img src="http://timg.fentiku.com/393/2021/10/19/czcy6MI1ch.png" title='czcy6MI1ch.png' alt='czcy6MI1ch.png'/>
• C.游离T<img src="http://timg.fentiku.com/393/2021/10/19/x9OCrmDAn7.png" title='x9OCrmDAn7.png' alt='x9OCrmDAn7.png'/>
• D.结合T<img src="http://timg.fentiku.com/393/2021/10/19/NuBZCeO91w.png" title='NuBZCeO91w.png' alt='NuBZCeO91w.png'/>
• E.降钙素

正确答案：C